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The kernel of the container is the kernel of the host, and your host is ubuntu

After some research, it seems that the docker kernel is indeed the host kernel

• The difference between distributions mainly lies in the organizational form such as file directories and the difference in pre-installed software

• The docker image is just a packaged file system and does not include the system kernel

#查看系統(tǒng)的發(fā)行說明
cat /etc/issue

#uname是直接調用系統(tǒng)接口得到信息, shell的uname命令實際封裝了函數

#include <sys/utsname.h>
int uname(struct utsname *name);

In this case, it shouldn’t be a problem to see two differences.